Home / 1,403.28-2,104.78-478.72

Finding the Fourth Proportional to 1,403.28, 2,104.78 and 478.72

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Solution

The fourth proportional to 1,403.28, 2,104.78 and 478.72 is: 718.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,403.28 : 2,104.78 = 478.72 : x
  2. Step 2: Convert to fraction form
    1,403.28/2,104.78 = 478.72/x
  3. Step 3: Cross multiply
    1,403.28x = 2,104.78 × 478.72
  4. Step 4: Simplify right side
    1,403.28x = 1,007,600.28
  5. Step 5: Solve for x
    x = 1,007,600.28/1,403.28
  6. Step 6: Final answer
    x = 718.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.